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Posted: 6/14/2009 11:47:07 AM EDT
| I have had this SP 1 upper laying around since I bought My first SP 1 in 1975 and put a Fwd asst upper on it , I would like to use it to build a Retro 601 useing a NDS lower and a Young Slick sided chrome bolt carrier , My only consern is the large front take down hole , My plan is to make a alum or steel plug for the hole and then redrill it to match the lower's hole , then use a NDS 601 take down pin , can anyone see any problem with this ? |
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if you look at a offset bushing ,it is very thin on the thin side. it would make more sense and be easier to install a offset bushing, either semi- or fully permanantly , to your upper. i've heard of silicone for easy removal to epoxy for permanence. if you don't secure it , it rotates and is a pain. whatever you choose, do it right the first time.
i would would shy away from permanantly gluing a bushing to my upper, but i'm told i have commitment issues. leave your options open, might come across a sp-1 lower! it could happen.... small pin uppers are very common, obviously. there are a finite amount of sp-1 uppers and they aint no more! |
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